BEAT frosting and marshmallow creme in medium bowl until smooth. Place room temperature cake layer, rounded side down, on serving plate. Frost top of cake.

PLACE frozen cake layer, rounded side up, on cutting board. To make pond in cake layer, use small sharp knife to cut out an irregular 6x4-inch oval-shaped hole, no closer than 1 1/2-inches from edge of cake. Remove oval piece of cake. Place frozen cake layer, rounded side up, on top of frosted cake layer. Frost sides and top of cake.

FROST inside of pond heavily, being sure to seal completely. Cut oval cake piece in half lengthwise. Place 1 half on top of cake close to pond for sliding hill. Secure by inserting 3 pretzel sticks into hill. Frost hill. Save other half of oval cake for another use.

PREPARE gelatin as directed on package for speed set, using hot water and ice cubes. Carefully spoon slightly thickened gelatin into pond to within 1/4-inch of top of cake. Refrigerate 2 hours or until gelatin is firmly set. Save remaining gelatin for another use. At this point, cake can be covered and refrigerated for up to 2 days before decorating.

DECORATE cake as desired. Decorated cake can stand at room temperature for up to 4 hours before serving.

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